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Finding the Third Proportional to 421.50 and 507.75

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Solution

The third proportional to 421.50 and 507.75 is: 611.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.50 : 507.75 = 507.75 : x
  2. Step 2: Convert to fraction form
    421.50/507.75 = 507.75/x
  3. Step 3: Cross multiply
    421.50x = 507.75 × 507.75
  4. Step 4: Simplify right side
    421.50x = 257,810.06
  5. Step 5: Solve for x
    x = 257,810.06/421.50
  6. Step 6: Final answer
    x = 611.65

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Why These Related Problems?

These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.